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  • Articles: DFG German National Licenses  (8)
  • 1990-1994  (8)
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  • Articles: DFG German National Licenses  (8)
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  • 1
    Electronic Resource
    Electronic Resource
    Magnetism in metastable bcc and fcc iron-copper alloys : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6580-6582 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present linearized augmented plane-wave calculations for FeCu fcc and bcc metastable phases using the local density approximation. Curves for the density of states (without including the spin-polarization effects) at several Fe concentrations are given, noticing that the density of states at the Fermi level for determinated fcc alloys suffers significant large increases in relation to the fcc Fe. This fact provides an explanation to the magnetic character found in some fcc FeCu alloys. The magnetization is calculated at different compositions by applying the Stoner criteria, assuming a simple behavior for the magnetic exchange integral, and including the effect of randomness in a simple way. We find that the magnetic moment per Fe atom is similar to that of bcc Fe for some fcc FeCu alloys.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356901
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetoresistance of paramagnetic metallic layers sandwiched between ferromagnetic layers : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 5861-5863 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Experimental results on magnetoresistance of Fe/Cr/Fe trilayers and multilayers show a large enhancement of this magnitude for a thickness of approximately 10 layers and decreases exponentially with the number of layers. In this work it is proposed that the key point to understand these experiments may lay in the fact that the exchange field of the ferromagnets penetrates in the paramagnet as has recently been proposed by the authors to explain coupling energies in trilayers. Even if the decay length of the penetrating field is small, of the order of nearest neighbors in Fe, its magnitude is large (1000 T), larger than any applied saturation field. The ferromagnetic and antiferromagnetic configurations give rise to two different field configurations and therefore to two different values of the resistance. In the opinion of the authors this is controlled by the effective section that the electrons can go. Also, it is not doubtful that the magnetoresistance is large but that the magnetic field (scattering spin potential) that the electrons see is large. It is found that the magnetoresistance is very much structure or roughness dependent and increases, in first approximation, with its amplitude. The magnetoresistance depends exponentially with the number of paramagnetic layers with a 10–20-A(ring) decay length, but does not oscillate; it is a smooth function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350137
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Correlation effects on Raman scattering from low-energy vibrational modes in fractal and disordered systems. I. Theory (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 2040-2045 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: In disordered fractal or nonfractal systems, the disorder induces rapid fluctuations of the acoustical vibrational wave functions, so that statistics can be used to resolve the problem of Raman scattering from localized low-energy vibrations. We derive the expressions of light-vibration coupling coefficient, C(ω), as a function of the frequency ω, in the case of the dipole-induced dipole mechanism of susceptibility fluctuation and for different types of correlation, from full correlation to no-correlation. The results are compared to the existing numerical calculations. The expressions of C(ω) are determined for other mechanisms of susceptibility fluctuations, depending on an interaction propagating in the fractal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465267
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  • 4
    Electronic Resource
    Electronic Resource
    Is the observed quantized conductance on small contacts due to coherent ballistic transport? (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 901-903 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This letter revises the interpretation of recent experiments showing quantized conductance on GaAs/GaAlAs constrictions or point contacts in terms of coherent ballistic and sequential transport. Our calculations show by using a first iterative self-consistent procedure that the experimental data can also be reconciled with sequential transport. The mean free path concept in the constriction is discussed in comparison with that of the reservoirs. We conclude that, for the higher modes, the former is much smaller than the latter, implying that in the constriction the transport may be sequential.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.102623
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Characterization of the conductivity of organic thiols by field emission microscopy and field emission spectroscopy (1994)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 116 (1994), S. 11985-11989 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00105a045
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Low-energy-electron diffraction by nano-objects in projection microscopy without magnetic shielding (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 2493-2495 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This paper shows that by using nanotips as nanosources of electrons, Fresnel diffraction by nano-objects is observed in a low-energy-electron projection microscope without any magnetic field shielding. The results shown are consistent with the Aharonov-Bohm effect and Lorentz force deviation due to the magnetic stray fields. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.112648
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    PROBING THE UNIVERSAL CHARACTER OF WAVE PROPAGATION IN RANDOM MEDIA (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 581 (1990), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1990.tb22722.x
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  • 8
    Electronic Resource
    Electronic Resource
    On the O2(1Δ g )-mediated photooxidative behaviour of tripeptide glycyl-tyrosyl-alanine in alkaline medium A kinetic study (1993)
    Springer
    Amino acids 4 (1993), S. 101-110 
    Details
    ISSN: 1438-2199
    Keywords: Amino acids ; Singlet-oxygen ; Peptides ; Photooxidation ; Kinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The type II singlet molecular oxygen [O2(1Δ g )]-mediated photo-oxidation of the tripeptide gly-tyr-ala was studied. It has two non-oxidizable amino-acids (gly and ala) bonded to the oxidizable one, tyr. Overall (k t) and reactive (k r) rate constants for the interaction were determined by time-resolved methods (IR emission of O2(1Δ g )) and stationary photolysis, in water at pH 11.5 as well as in alkaline non-aqueous etOH-MeCN (80:20, v/v, 10 mM in KOH) solutions. An important solvent polarity effect onk t was detected; the rate constant increasing one order of magnitude in going from the organic mixture to water (k t H2O = 2 × 109 M−1 s−1). Nevertheless,k r does not parallel this trend; gly-tyr-ala being less photooxidizable in a more polar environment. The effective quantum yield (∅ r ) forTPE photooxidation is much higher in etOH-MeCN (∅ r = 0.056) than in water (∅ r = 0.023). Results are discussed on the basis of the formation of an exciplex with polar character between the TPE and O2(1Δ g ). Two remarkable points should be taken into account: a) the rate costants for the interaction of O2(1Δ g ) with gly-tyr-ala are practically the same as for free tyr. b) New -NH2 groups are generated upon sensitized irradiation. Both findings indicate that the peptide bonds in the TPE break as a result of the photooxidation. A thorough analysis with data for tyrosine and related dipeptides is undertaken.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00805805
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    Paper (German National Licenses)
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